Because the filesystem problems I was having were with the root partition, I first had to boot a rescue OS, in this case UBCD (Ultimate Boot CD) running off a USB key. The "parted magic" option in the menu gives you a Linux OS from which you can run the file checking tools:

lvm pvscan lvm vgscan The volume group reported in my case was vg_starbug, with logical volumes lv_home and lv_root. So now to check the root volume: fsck /dev/vg_starbug/lv_root

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